This is a really nice and famous anecdote which i stumbled upon after about 2 years now.
A must read for all those who think they know it all about Relationships

"You think you have family problems? Listen to my situation."
"A few years ago I met a young widow with a grown-up daughter. We got
married and got myself a stepdaughter. Later, my father married my
stepdaughter. That made my stepdaughter, my step-mother, and my father
became my stepson. Also, my wife became mother-in-law of her
father-in-law."
"Much later the daughter of my wife, my stepmother, had a son. This boy
was my half-brother because he was my father's son. But he was also the
son of my wife's daughter which made him my wife's grand-son. That made
me the grand-father of my half-brother."
"This was nothing until my wife and I had a son. Now the half-sister of
my son, my stepmother, is also the Grandmother. This makes my father,
the brother-in-law of my child, whose step-sister is my father's wife, I
am my stepmother's brother-in-law, my wife is her own child's aunt, my
son is my father's nephew and I am my OWN GRANDFATHER!"

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